Medline Oxygen Regulators: Medline oxygen regulators use an advanced, patented Intelliflo disc to regulate oxygen flow down to 1/32 LPM with very tight tolerances. Featuring a brass core for maximum safety and permanent laser etchings on knob and body that won't peel, flake or wear off. All metal anodized aluminum construction is more durable than plastic and will not rust, plus the gauge protector helps prevent damage. Five-year warranty (excludes contents gauge and gauge protector). 1/2 to 15LPM, Small Tank Regulator.